How do I make the area brighter so I can see vertices in really dark areas or angles?
I found a really handy trick for this and maybe it will help someone else out too.

First, make a duplicate of your lamp.
Then position that second lamp so it's Behind your camera, not in front (really important)
Parent the lamp to the camera by dragging and dropping the lamp onto the camera in the hierarchy.
Finally, press 0 on your keypad to go into camera mode, then press Ctrl + F to go into free camera mode and move about normally.

You'll notice now that you have much more light then before and if you have multiple viewport windows open, you can even see the camera and lamp move around together (so you can see it working, not that useful but still cool!)

When you finished all your work on your model, delete the lamp :)

Hope this helps somebody out there! :)